<br>
<br>
<div class="search_2 marginTop10">
    <form action="?main=search" method="POST" class="search_form">
        <select id="selected_search" class="selected_search" name="selected_search">
            <option>Lựa chọn</option>
            <option value="1">Sản phẩm</option>
            <option value="2">Tin tức</option>
            <option value="3">Bài viết</option>
        </select>
        <input class="search_keyword" type="text" placeholder="Tìm kiếm" class="search-input" value=""  name="keyword" id="txtSearchKey" />
        <input type="submit" class="search_submit" value=""/>
    </form>
</div>